CN104659447B - Based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator - Google Patents
Based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator Download PDFInfo
- Publication number
- CN104659447B CN104659447B CN201310597545.0A CN201310597545A CN104659447B CN 104659447 B CN104659447 B CN 104659447B CN 201310597545 A CN201310597545 A CN 201310597545A CN 104659447 B CN104659447 B CN 104659447B
- Authority
- CN
- China
- Prior art keywords
- microstrip line
- coupling ring
- ring shape
- shape resonator
- short circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The invention discloses it is a kind of based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator, including a terminal short circuit from coupling ring shape resonator, two coupled microstrip lines.The present invention uses microstrip design.The present invention has many advantages, such as that light-weight, reliability is high, has excellent performance, temperature stability is good, mass production is at low cost, broad prospect of application is respectively provided with for each frequency range radar, communication and following high data rate wireless communication, is particularly had in the corresponding system of rigors to weight, performance, reliability.
Description
Technical field
The invention belongs to microwave and millimeter wave technical field, it is particularly a kind of based on terminal short circuit from coupling ring shape resonator
Narrowband differential bandpass filter.
Background technology
With the fast development of modern wireless communication systems, the demand of balancing circuitry and application become more and more important.Difference
Filter-divider is seemed in balancing circuitry structure and is even more important with its good anti-noise jamming and dynamic range characteristics.For
For one preferable difference filter structure, only required difference mode signal is by filter structure, while common-mode signal is pressed down
System.In addition, difference filter must have preferable edge selection characteristic and harmonic responses.In recent years, there has been proposed
Many different types of difference filter structures, the needs of to meet narrowband, double frequency-band or broadband and high common mode inhibition.
In recent years, there is scholar first proposed a kind of based on multistage broadband couple device differential bandpass filter structure, but the structure due to
Lack the inhibition to common-mode signal, thus be difficult to be applied in balancing circuitry as real difference filter.In order to overcome
This shortcoming, a kind of super wide band microstrip differential bandpass filter with good common-mode rejection properties are designed to apply, but
In order to meet the requirement of ultra wideband frequency, but it is connected since it is multistage, increases entire circuit volume；And believe with outer common mode
Number inhibition it is also undesirable.In order to reduce volume, there is scholar to use coupled resonators and coupling line improve common mode inhibition and
The upper limit stopband of differential mode is extended, but its differential loss is again bigger.Based on above analysis, we have proposed based on terminal short circuit from
The narrowband differential bandpass filter of toroidal cavity resonator is coupled, and not yet finds its correlative study and report.
Invention content
The purpose of the present invention is to provide a kind of very high differential mode passband selectivity, precipitous sideband, high common mode inhibition, bodies
Product is small, light-weight, reliability is high, easy to process and at low cost poor from the narrowband of coupling ring shape resonator based on terminal short circuit
Divide bandpass filter.
Realizing the technical solution of the object of the invention is：It is a kind of based on terminal short circuit from the narrowband difference of coupling ring shape resonator
Bandpass filter, including terminal short circuit from coupling ring shape resonator, the terminal short circuit is from four micro-strips of coupling ring shape resonator
Line is respectively the first microstrip line, the second microstrip line, third microstrip line, the 4th microstrip line in the direction of the clock, and the first microstrip line is
Rectangular top, wherein the first microstrip line and third microstrip line are symmetrical above and below, the second microstrip line and the 4th microstrip line or so pair
Claim, the second microstrip line right end sets the first plated-through hole, the first microstrip line and the 5th microstrip lines, third microstrip line and the
Six microstrip lines, the 6th microstrip line Single port be first input end, other end mouth be the first output terminal, the 5th microstrip line one
Port is the second input terminal, another port is second output terminal, and the 5th microstrip line and the 6th microstrip line are symmetrical above and below along TT ',
Wherein TT ' is center line of the rectangle terminal short circuit from coupling ring shape resonator.
Compared with prior art, the present invention its remarkable advantage is：1）The present invention, which can have, is inserted into damage in smaller differential mode band
Consumption, larger return loss, flat group delay, higher common mode inhibition；（2）Circuit structure is simple, it is only necessary to a metal
Change through-hole and several microstrip lines；（3）It is easily achieved in technique；（4）Utilize micro-strip high-temperature stability and reliability so that element
With high-temperature stability and high reliability.
The present invention is described in more detail with reference to specific embodiment.
Description of the drawings
Fig. 1 is from the narrowband differential bandpass filter of coupling ring shape resonator from coupling ring the present invention is based on terminal short circuit
Shape resonator schematic diagram.
Fig. 2 is from the narrowband differential bandpass filter of coupling ring shape resonator from coupling ring the present invention is based on terminal short circuit
Shape resonator common mode, differential mode equivalent circuit figure.
Fig. 3 is from the narrowband differential bandpass filter of coupling ring shape resonator from coupling ring the present invention is based on terminal short circuit
Shape resonator common mode, differential mode resonant frequency comparison diagram.
Fig. 4 is from the narrowband differential bandpass filter of coupling ring shape resonator from coupling ring the present invention is based on terminal short circuit
Shape resonator resonant frequency and length l1Between relational graph.
Fig. 5 is from the narrowband differential bandpass filter of coupling ring shape resonator from coupling ring the present invention is based on terminal short circuit
Shape resonator odd even mould parameter with from coefficient of coup k relational graphs.
Fig. 6 is from the narrowband differential bandpass filter of coupling ring shape resonator from coupling ring the present invention is based on terminal short circuit
The common mode of shape resonator, differential mode zero with from coefficient of coup k relational graphs
Fig. 7 is the terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator the present invention is based on terminal short circuit
From the frequency response chart of coupling ring shape resonator.
Fig. 8 is the balancing filter from the narrowband differential bandpass filter of coupling ring shape resonator the present invention is based on terminal short circuit
Device applying frequency response diagram.
Specific embodiment
The invention discloses it is a kind of based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator, including
Terminal short circuit is rectangle from coupling ring shape resonator from coupling ring shape resonator, the terminal short circuit, and four microstrip lines are by suitable
Clockwise is respectively the first microstrip line 1, the second microstrip line 2, third microstrip line 3, the 4th microstrip line 4, and the first microstrip line 1 is length
Rectangular top, wherein the first microstrip line 1 and third microstrip line 3 are symmetrical above and below, the second microstrip line 2 and the 4th microstrip line 4 or so
Symmetrically, 2 right end of the second microstrip line sets the first plated-through hole V1, the first microstrip line 1 couples with the 5th microstrip line 5, and third is micro-
Band line 3 is coupled with the 6th microstrip line 6, and 6 Single port of the 6th microstrip line is first input end 7, and other end mouth is the first output terminal
8,5 Single port of the 5th microstrip line be the second input terminal 7 ', another port be second output terminal 8 ', the 5th microstrip line 5 and the 6th
Microstrip line 6 is symmetrical above and below along TT ', and wherein TT ' is center line of the rectangle terminal short circuit from coupling ring shape resonator.
First plated-through hole V of 2 right end of the second microstrip line1It is connected to the ground.
It is described to be adjusted from coupling ring shape resonator dimensions, dimension of microstrip line, plated-through hole.
5th microstrip line 5 is equal with the width of the 6th microstrip line 6, and is coupled certainly more than rectangle terminal short circuit is formed
The width of four microstrip lines of toroidal cavity resonator.
The common mode and differential-mode input impedance of the wave filter meet the following formula：
In formula, meaning of parameters is：ZoeIt is the characteristic impedance of even mould, ZooIt is the characteristic impedance of strange mould, θ is the 5th microstrip line 5
Or the 6th microstrip line 6 electrical length.
The present invention is described in further detail below in conjunction with the accompanying drawings.
With reference to Fig. 1, Fig. 2, the present invention is based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator, wrap
Terminal short circuit is included from coupling ring shape resonator, the terminal short circuit from four microstrip lines of coupling ring shape resonator in the direction of the clock
Respectively the first microstrip line 1, the second microstrip line 2, third microstrip line 3, the 4th microstrip line 4, the first microstrip line 1 are on rectangular
Side, wherein the first microstrip line 1 and third microstrip line 3 are symmetrical above and below, the second microstrip line 2 and the 4th microstrip line 4 are symmetrical, and second
2 right end of microstrip line sets the first plated-through hole V1, the first microstrip line 1 couples with the 5th microstrip line 5, third microstrip line 3 and
Six microstrip lines 6 couple, 6 Single port of the 6th microstrip line be first input end 7, other end mouth be the first output terminal 8, the 5th micro-strip
5 Single port of line is the second input terminal 7 ', another port is second output terminal 8 ', the 5th microstrip line 5 and 6 edge of the 6th microstrip line
TT ' is symmetrical above and below, and wherein TT ' is center line of the rectangle terminal short circuit from coupling ring shape resonator.
The size of the dimension of microstrip line, the size of plated-through hole and coupling spacing is adjusted, and is according to different materials
The dielectric-slab of material and the working frequency of setting are come determining.
The present invention is based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator, operation principle is sketched
It is as follows：Fig. 1 gives the schematic diagram from coupling ring shape resonator of terminal short circuit, and Fig. 2 gives his differential mode, common mode equivalent electricity
Lu Tu, Zoe, Zoo, θeAnd θoIt is the electrical length of even mould, the characteristic impedance of strange mould and parallel coupled line respectively.Assuming that θe=θo=θ, then
It can obtain the input impedance of common mode and differential mode
As shown in figure 3, for common mode, in θ=pi/2, there are one transmission zeros, for differential mode, have all-pass characteristic.However,
Work as θe≠θoWhen, zero fcIt can slightly move, for differential mode, at this time in 2fcAlso occur a zero at frequency point, however
This zero is that we are not intended to generate, and this phenomenon is related with the microstrip line of non-uniform dielectric.
In order to verify the influence from coupling ring shape resonator to balance bandpass filter application, it will further discuss two
A zero fcAnd fdWith from the relationship between the parameter of coupling ring shape resonator.First, it is it is contemplated that long from coupling ring shape resonator
Spend l1Influence.Fig. 4 describes different length l1Corresponding different common mode resonance frequency fcWith differential mode resonant frequency fd.From Fig. 4
In find out fcAnd fdAll by l1Effect length, and fdIt is still equal to 2fc.Secondly, we are considered further that from coupling ring shape resonator
From the influence of coefficient of coup k.Fig. 5 is described from coefficient of coup k and the characteristic impedance from coupling ring shape resonator idol mould and Qi Mo
(ZoeAnd Zoo), dielectric constant (εeAnd εo) between variation tendency.It is apparent that it is different from coefficient of coup k, characteristic can be hindered
Anti- and electrical length size variation.As k=0, when coupling effect can be ignored, even mould and strange mould parameter are equal.fcAnd fdBetween k
Correspondence it is as shown in Figure 6.Obviously, fcIncrease, f with the increase of k valuesdReduce with the increase of k values；Resonant frequency
fdIn close coupling far from 2fc.Generally speaking, broader differential mode passband in order to obtain selects a smaller value k so that
Resonant frequency fdWith fcFrom it is farther.
Further detailed description is done to the present invention with reference to embodiment：
Embodiment is narrowband differential bandpass filter of the terminal short circuit from coupling ring shape resonator.Referring to Fig. 1, the filter is introduced
The final circuit size parameter of wave device：First microstrip line 1 and 3 length and width of third microstrip line are respectively l1=20mm, w1=
0.4mm；Second microstrip line 2 and 4 length and width of the 4th microstrip line are respectively s=0.8mm, w1=0.4mm；First microstrip line 1 with
5th microstrip line 5 coupling spacing is g1=0.3mm；Third microstrip line 3 couples spacing with the 6th microstrip line 6 as g1=0.3mm；5th
5 and the 6th microstrip line 6 of microstrip line is all 50 Ω microstrip lines.The frequency response of differential bandpass filter is as shown in Figure 7.It can from figure
To find out, from 0 to 4.8GHz, differential signal is essentially unchanged, and there are one very narrow stopbands near 2.4GHz frequencies for common-mode signal.
In the broadband of 0-4.8GHz, the return loss of differential mode is more than 10dB, and insertion loss is less than 3dB；In the suppression of common mode center frequency point
System is more than 25dB.These characteristics are to have to improving common mode inhibition in the case where the differential mode frequency response of balance filter is constant
Great role.We have been applied the invention in balance filter, are found in common mode passband, are suppressed over 20dB；
In differential mode passband, inhibit to be more than even more 60dB, as shown in figure 8, haveing excellent performance.
The foregoing is merely two embodiments of the present invention, are not intended to limit the invention, all in spirit of the invention
Within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of the present invention.
Claims (1)
1. it is a kind of based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator, which is characterized in that including end
For terminal shortcircuit from coupling ring shape resonator, rectangle of the terminal short circuit from coupling ring shape resonator for four microstrip line compositions should
Four articles of microstrip lines are respectively the first microstrip line (1) in the direction of the clock, the second microstrip line (2), third microstrip line (3), the 4th micro-
Band line (4), the first microstrip line (1) is rectangular top, wherein the first microstrip line (1) and third microstrip line (3) are symmetrical above and below,
Second microstrip line (2) and the 4th microstrip line (4) are symmetrical, and the second microstrip line (2) right end sets the first plated-through hole (V1),
First microstrip line (1) is coupled with the 5th microstrip line (5), and third microstrip line (3) is coupled with the 6th microstrip line (6), the 6th microstrip line
(6) Single port is first input end (7), and other end mouth is the first output terminal (8), and the 5th microstrip line (5) Single port is second
Input terminal (7 '), another port are second output terminal (8 '), and the 5th microstrip line (5) is whole along rectangle with the 6th microstrip line (6)
The center line (TT ') of terminal shortcircuit from coupling ring shape resonator is symmetrical above and below, first plated-through hole of the second microstrip line (2) right end
(V1) be connected to the ground, the 5th microstrip line (5) is equal with the width of the 6th microstrip line (6)；From coupling ring shape resonator dimensions, micro-strip
Linear dimension, plated-through hole are adjusted；The width of 5th microstrip line (5) and the 6th microstrip line (6), which is more than, forms rectangle terminal
Short circuit is from the width of four microstrip lines of coupling ring shape resonator；The common mode and differential-mode input impedance of the wave filter meet following public
Formula：
In formula, meaning of parameters is：ZoeIt is the characteristic impedance of even mould, ZooThe characteristic impedance of strange mould, θ be the 5th microstrip line (5) or
The electrical length of 6th microstrip line (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310597545.0A CN104659447B (en) | 2013-11-22 | 2013-11-22 | Based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310597545.0A CN104659447B (en) | 2013-11-22 | 2013-11-22 | Based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104659447A CN104659447A (en) | 2015-05-27 |
| CN104659447B true CN104659447B (en) | 2018-06-12 |
Family
ID=53250310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310597545.0A Expired - Fee Related CN104659447B (en) | 2013-11-22 | 2013-11-22 | Based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104659447B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244573A (en) * | 2015-10-30 | 2016-01-13 | 南京理工大学 | Dual-mode high-performance balance band-pass filter based on E-shaped resonators |
| CN111653853B (en) * | 2020-06-11 | 2021-08-17 | 浙江大学 | Sawtooth type stripline common mode filter circuit without through holes |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000039409A (en) * | 1998-12-12 | 2000-07-05 | 이계철 | Wave filter using disconnected type ring resonator |
| CN102522616A (en) * | 2012-01-03 | 2012-06-27 | 西安电子科技大学 | Micro-band dual-mode band-pass filter based on double-end short-circuit resonator |
| CN202423521U (en) * | 2012-01-16 | 2012-09-05 | 电子科技大学 | Ultra-wideband microstrip filter |
| CN203644912U (en) * | 2013-11-22 | 2014-06-11 | 南京理工大学 | Narrowband difference band-pass filter based on terminal-short-circuit self-coupling annular resonator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515661B (en) * | 2009-03-26 | 2012-10-31 | 上海大学 | Microstrip dual-mode filter of nesting ring-structured parallel feeder lines |
| KR101288547B1 (en) * | 2009-12-18 | 2013-07-22 | 한국전자통신연구원 | Microstrip patch antenna |
-
2013
- 2013-11-22 CN CN201310597545.0A patent/CN104659447B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000039409A (en) * | 1998-12-12 | 2000-07-05 | 이계철 | Wave filter using disconnected type ring resonator |
| CN102522616A (en) * | 2012-01-03 | 2012-06-27 | 西安电子科技大学 | Micro-band dual-mode band-pass filter based on double-end short-circuit resonator |
| CN202423521U (en) * | 2012-01-16 | 2012-09-05 | 电子科技大学 | Ultra-wideband microstrip filter |
| CN203644912U (en) * | 2013-11-22 | 2014-06-11 | 南京理工大学 | Narrowband difference band-pass filter based on terminal-short-circuit self-coupling annular resonator |
Non-Patent Citations (1)
| Title |
|---|
| 一种新型环谐振器在带通滤波器中的应用;韩华强;《传感器世界》;20100531(第05期);18-21 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104659447A (en) | 2015-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103367845B (en) | Ultra-wideband micro-strip balance filter | |
| CN104659450B (en) | A kind of broadband bandpass filter based on cross resonator | |
| CN112366436A (en) | Filtering type crossing directional coupler with broadband pass response and design method | |
| CN105762471A (en) | I-shaped differential band-pass filter based on transversal filter theory | |
| US7511596B2 (en) | Dual bandpass filter having serial configuration of coupled-line filters | |
| CN104659447B (en) | Based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator | |
| CN203674352U (en) | Broadband difference band pass filter based on cross-shaped resonator | |
| Bharathi et al. | Design and analysis of interdigital microstrip bandpass filter for centre frequency 2.4 GHz | |
| Lee et al. | Dual-band balanced BPF using λ/4 stepped-impedance resonators and folded feed lines | |
| CN106785261B (en) | A kind of adjustable bandpass filter of narrowband trap | |
| CN203644912U (en) | Narrowband difference band-pass filter based on terminal-short-circuit self-coupling annular resonator | |
| CN104409813A (en) | Vertical interdigital filter based on source-load coupling | |
| CN109687066B (en) | A kind of miniature ultra wide band plane bandstop filter | |
| CN104009271B (en) | A kind of plane bandpass filter based on cascade four resonators | |
| CN203300774U (en) | Microstrip balance filter | |
| US20180248243A1 (en) | Filtering Unit and Filter | |
| CN106058399B (en) | A kind of band-pass filter with wide stop band | |
| CN203351719U (en) | Ultra wideband micro-strip balance filter | |
| CN203883097U (en) | Dual-mode balance filter based on microstrip and slotted line structures | |
| CN103985928B (en) | A kind of ultra broadband balanced filter based on slotted line structure | |
| CN101728610B (en) | Band-pass filter | |
| KR20160117041A (en) | UWB bandpass filter using stepped impedance short and open circuited stub | |
| CN203721858U (en) | Ultra-wideband trap wave filter | |
| CN103618123B (en) | The quantifiable tuning methods of microstrip filter | |
| Zhou et al. | Multi-Mode and Ultra-Wideband Common-Mode Filter Based on Asymmetric Short-Stub Loaded Resonator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180612 Termination date: 20191122 |